Slide fastener



y 2, 1953 J. HQRA 2,637,886

SLIDE FASTENER Filed Dec. 5, 1950 'INVENTORI 5 Man 60 Patented May 12,1953 SLIDE FASTENER Josef Hora, deceased, late of Melide, Switzerland,by Walther Trautwein, administrator, Burg, Post Kirchzarten, Breisgau,Germany, assignor to Gerber and'Hora,,Melide, Switzerland ApplicationDecember 5, 1950, Serial No. 199,200 In Switzerland April 6, 1950 r Thepresent invention relates to a slide fastener which comprises engagingmembers provided with projections and receiving members provided withrecesses for receiving the said projections.

In such type of fastener, any two opposite members are interconnectable,without bearing onv each other as. in the case of known slide fasteners,thereby preventing the interengaged members from being disengaged. Suchtype of fastener therefore is more flexible than the known slidefasteners and is prevented from unintended opening even when subjectedto pronounced buckling.

According to the present invention, a better L engagement of the closuremembers is attained by so forming two noses on each projection of theengaging members and two hollows in each recess of the receiving membersthat one nose is introduceable into its appurtenant hollow when a pairof opposite members are inclined under a certain definite angle withrespect to each other, whereupon the other nose is introduceable intothe other hollow by twisting the members relatively to each other, thelatter thus being secured against disengagement by the interengagednoses and hollows.

The drawing shows one form of invention.

Fig. 1 shows a portion of the slide fastener in elevation, the slidebeing shown in section,

Fig. 2 is a cross-section on the line 11-11 of Fig. 1, and

Figs. 3 and 4 are end views of the two kinds of fastener members used.Fastener members 3 and 4 are secured to the adjacent sides of twocarrier tapes I and 2 respectively, and are engageable and disengageableby moving back and forth a slide 5. Each member 3 on its outside endface and on both sides of a centre slot 6 (Fig. 3) comprises aprojection 'l and 8 respectively. Each of the latter comprises twoengaging noses 9 and I spaced from the body of the respective fastenermembers by a restricted portion 18, the noses 9 bein slightly longerthan the noses ll]. Each fastener member 4 comprises a center web H onits outside end face and a recess l2 and 13, respectively, on both sidesof said web. In each recess two diverging hollows l4 and I are provided,of a shape corresponding to that of the engaging noses 9, l0

and which form opposed lugs 19 and 20 on opposite sides of the recesses.The hollow I4 is slightly larger than the hollow l5. Between the twohollows l4, I5 a land I6 is provided which coacts with a countergroovel1 formed on the f1 Claims. (Cl. 24205.13)

2 fastener member 3 between the engaging noses 9 and Hi.

When closing the slide fastener, the interengaging pairs of closuremembers 3, 4 are inclined towards each other under a certain angle inthe slide 5, as shown in Fig. 1 by the two topmost pairs of members.First the engaging nose 9 of each closure member 3 is introduced intothe hollow l4 past the lugs I9 and 20 of each closure member 4. Bysubsequently turning the two members, the other engaging noses Ill areintroduced into the hollows [5 past the lugs l9 and 20, the lands I6 andgrooves H are hobbing on each other and the engaging noses 9 areslightly moved out again from the hollows I4 without, however, entirelyleaving the latter. The members 3, 4 thus are positively interengagedand secured against pulling apart. In this way, the fastener isprevented from springing open when being bent. Further, the members aresecured in the closing position against lateral movement by means of thecentral groove 6 in the closure members 3 and of the central web H inmember 4, which web enters groove 6. Instead of groove 6 and web H, aplurality of interengaging grooves and webs or ribs could be providedfor preventing the members 3 and 4 from laterally disengaging, Whichgrooves and ribs could be laterally disposed.

What is claimed is:

1. In a slide fastener having opposed aligned pairs of cooperatingfastener members mounted on the adjacent edges of parallel flexiblestringers and a slide movable along the stringers to engage anddisengage the fastener members, one fastener member of each pair havingspaced projections extended toward the other fastener member of eachpair, the other fastener member of each pair having recesses spaced by acentral web and opening toward the spaced projections to receive theprojections when the slide is moved to engage the pairs of fastenermembers and cause said web to be engaged in the spaces between saidspaced projections to retain said fastener members against transverseseparation, each of said projections having a pair of noses separatedfrom the respective fastener member by a restricted portion said nosesof each pair being of unequal length and diverged toward the respectiveother fastener member in a plane parallel to the plane of the stringers,each of said recesses having a pair of hollows of unequal length anddiverged away from the respective one fastener member in a planeparallel to the plane of the stringers, the longer nose of each pair ofnoses and the longer hollow of each pair of hollows being extended in adirection away from the direction in which the slide is moved to engagethe pairs of fastener members, so constructed and arranged that when theslide is moved to engage the pairs of fastener members said projectionsare inserted into said recesses with the longer noses of saidprojections moving first into the longer hollows of said recesses, afterwhich the shorter noses of said projections are moved into the shorterhollows of said recesses retaining the fastener members .fa ainst beingpulled apart by sidewise pulls on :the stringers.

2. A slide fastener according to claim 1, wheree in the hollows of eachrecess are separated by a land extended toward the respective onefastener member, said noses of said projections being separated by acountergroove, said lands being received in said countergrooves when thefastener members are to rete the respective noses in position in theirrespe e hollows.

g opposed on adjaoentedgeportions-to be re together and a slide formoving the members relative to the edge :porf' jection extended towardthe ct ber of each pair, the other fastener member of each pair having arecess o'oci toward projection :to receive the r act e projection whenthe .slide is moved .to e1 ,3 the 3?- fastener -n1embers, each of saidp1 e ections having a pair of noses separated n the tive fastenermemberby a rest lcted port noses .of each pair being of unequal iendiverged toward the respective other fastener member in a plane parallelto the plane of the stringers, each of said recesses having a pair ofhollows of unequal length and diverged away from the respective onefastener member in a plane parallel to .the plane of the stringers, thejlonger nose of each pair 10f noses and the longer hollow of each pairof hollows being extended in a direction away from the direction inwhich the slide is moved to engage the pairs of fastener members, soconstructed and arranged that when the slide :is ,moved to engage thepairs of iastener members said projections are inserted into :saidrecesses with the longer noses of said sprojections moving first intothe longer hollows of said recesses after which the shorter noses ofsaid projections are moved into the shorter hollows of said recessesretaining the fastener members against being pulled apart by sidewisepulls on the stringers.

4 A .;slide fastener according to claim .3, including means forretaining the fastener members against ,being separated by relativemoveent in a plane normal to the stringers.

WALT'HER TRAUTWEIN, Administrator of the estate of Josef Hora,

deceased.

fiefierencesflited in the file of this patent UNITED STATES PATENTSNumber Name ,Date

'1-,8 1-3,385 Dalton l July I, 19:31 1,893,379 Sundbaclc Jan. 3, 19331,918,721 Sundback July 18,1933

FOREIGN PATENTS N-uinber Country Date 548,898 Germany of 1932

